In-line coagulation prior to UF of treated domestic wastewater – foulants removal, fouling control and phosphorus removal

Zheng, Xing; Plume, Stephan; Ernst, Mathias; Croué, Jean-Philippe; Jekel, Martin

doi:10.1016/j.memsci.2012.02.051

Cited by 49 publications

(33 citation statements)

References 30 publications

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“…The effluent from the secondary clarifier was used as feed water directly to the pilot UF after a pre-filter with a pore size of 100 µm, and for the lab-scale UF test after pre-filtration using cellulose nitrate filter with a pore size of 0.45 µm (Satorious). More detailed information about the plant can be found in previous studies [23].…”

Section: Secondary Effluentmentioning

confidence: 99%

“…Pilot scale investigations were carried out using a dead-end pressure driven UF pilot plant with hydrophilized PES membranes (hollow fibre membrane, Dizzer 450, Inge AG, Inge, Greifenberg, Germany) after a pre-filter (100 µm mesh size) with no coagulant was used. Detailed information about the membrane can be found in a previous study [23]. In the present work, the UF unit was operated in dead-end filtration mode at a constant flux of 60 L/(m 2 ·h).…”

Section: Lab Scale Uf Testmentioning

confidence: 99%

“…In the present work, the UF unit was operated in dead-end filtration mode at a constant flux of 60 L/(m 2 ·h). According to preliminary tests the difference of trans-membrane pressure (TMP) increase rate with and without in-line coagulation was distinct under such flux and the increase rates in filtering both types of water under different coagulant dosages were in a reasonable range [23]. Therefore, the flux was fixed at 60 L/(m 2 ·h) during all pilot scale tests.…”

Section: Lab Scale Uf Testmentioning

confidence: 99%

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Understanding and Control of Biopolymer Fouling in Ultrafiltration of Different Water Types

Zheng

Zietzschmann

Plume

et al. 2017

Water

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Abstract:The present work focuses on understanding and control of biopolymer fouling in ultrafiltration of a typical surface water and nearby secondary effluent for direct and indirect portable use. Characterization results show that both kinds of biopolymers are of similar molecular weight. Longer than one year water quality monitoring results show that the C/N ratio in the secondary effluent biopolymers was relatively constant at around 4.8, while that in the surface water macromolecules fluctuated at around 6.9. Under a similar mass load, the investigated secondary effluent biopolymers lead to hydraulic resistance slightly higher than that caused by filtering surface water macromolecules; however, the correspondingly formed fouling is significantly less reversible by hydraulic backwashing. The quantity of the nitrogenous biopolymers in the secondary effluent demonstrated a strong correlation with the extent of the irreversible fouling in ultrafiltration (UF), while that from the surface water did not. In membrane fouling cleaning tests, certain detergent demonstrated high efficiency in removing the irreversible fouling after UF of the secondary effluent, but presented no effect in eliminating fouling caused by the surface water foulants. In-line coagulation using FeCl 3 prior to UF was shown as an effective fouling control method, but the effect depends heavily on the type of feed water.

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Section: Secondary Effluentmentioning

confidence: 99%

Section: Lab Scale Uf Testmentioning

confidence: 99%

Section: Lab Scale Uf Testmentioning

confidence: 99%

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Understanding and Control of Biopolymer Fouling in Ultrafiltration of Different Water Types

Zheng

Zietzschmann

Plume

et al. 2017

Water

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“…Aluminum chloride (AlCl 3 ) and polyaluminum chloride (PACl) are widely used as coagulants in water treatment processes [11][12][13][14]. Researchers believe that PACl is superior to traditional aluminum coagulants for the removal of turbidity and dissolved organic matter [15], resulting in a number of studies focused on the performance of different aluminum species [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effect of aluminum speciation on ultrafiltration membrane fouling by low dose aluminum coagulation with bovine serum albumin (BSA)

Wang

et al. 2015

Journal of Membrane Science

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a b s t r a c tUp to now, many studies have focused on ultrafiltration (UF) membrane fouling when sweep flocculation is the main coagulation mechanism. However, there has been less focus on cases where charge neutralization is the main coagulation mechanism. Herein, UF membrane performance was investigated when bovine serum albumin (BSA) was coagulated with low dose aluminum chloride (AlCl 3 ) or polyaluminum chloride (PACl). For AlCl 3 or PACl, a large flux decline occurred at pH 5.5 and membrane fouling was steadily alleviated with increasing pH, resulting in a strong correlation between membrane flux and the corresponding solution pH. As pH rose, the proportions of Al ms (monomeric and small polymeric alum species) and Al u species (i.e., solid phase Al(OH) 3 ) gradually increased. A correlation was also observed between membrane flux and the proportions of Al ms and Al u . Compared with AlCl 3 , much more serious membrane fouling was induced when BSA was coagulated with PACl, owing to the lower proportions of Al ms and Al u species in the PACl system. For AlCl 3 , the potential fouling mechanism was pore constriction or blocking when the proportions of Al ms and Al u were lower than 62.3 75.1% (pH 6.0), followed by cake layer as the main fouling mechanism. For PACl, however, pore constriction or blocking occurred when the proportions of Al ms and Al u were lower than 35.473.2% (pH 6.5), and cake layer gradually became the main fouling mechanism.

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“…Over the past few decades, coagulation/flocculation was widely used as a pretreatment step of microfiltration and ultrafiltration for water treatment [6,[19][20][21]. Kim et al [22] suggested that coagulation can improve the membrane flux and mitigate fouling by changing particle characteristics at low aluminum dosage and reducing the foulants loading at high aluminum dosage.…”

Section: Introductionmentioning

confidence: 99%

Insight into the combined colloidal-humic acid fouling on the hybrid coagulation microfiltration membrane process: The importance of aluminum

Xiao

Zhang

et al. 2014

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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In-line coagulation prior to UF of treated domestic wastewater – foulants removal, fouling control and phosphorus removal

Cited by 49 publications

References 30 publications

Understanding and Control of Biopolymer Fouling in Ultrafiltration of Different Water Types

Understanding and Control of Biopolymer Fouling in Ultrafiltration of Different Water Types

Effect of aluminum speciation on ultrafiltration membrane fouling by low dose aluminum coagulation with bovine serum albumin (BSA)

Insight into the combined colloidal-humic acid fouling on the hybrid coagulation microfiltration membrane process: The importance of aluminum

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